Inflationary magnetogenesis with added helicity: constraints from non-gaussianities
arXiv:1707.09750 · doi:10.1088/1361-6382/aac143
Abstract
In previous work, two of us have proposed a model of inflationary magnetogenesis based on a rolling auxiliary field able both to account for the magnetic fields inferred by the (non) observation of gamma-rays from blazars, and to start the galactic dynamo, without incurring in any strong coupling or strong backreaction regime. Here we evaluate the correction to the scalar spectrum and bispectrum with respect to single-field slow-roll inflation generated in that scenario. The strongest constraints on the model originate from the non-observation of a scalar bispectrum. Nevertheless, even when those constraints are taken into consideration, the scenario can successfully account for the observed magnetic fields as long as the energy scale of inflation is smaller than ~GeV, under some conditions on the slow roll of the auxiliary scalar field.
34 pages, 4 figures; published version, references added; changes in the requirements on the duration and velocity of the rolling of the auxiliary field; main conclusions unaffected
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- Vector dark matter production from inflation with symmetry breaking
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- Mixed Non-Gaussianity from Axion-Gauge Field Dynamics
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- Primordial Magnetogenesis in a Bouncing Universe
- Gravitational wave trispectrum in the axion-SU(2) model
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- Magnetogenesis from isocurvature initial conditions
- Primordial Weibel instability
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- When does the Schwinger Preheating Occur?